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These photos of Christopher Dorner were taken on Jan. 28, 2013, at an Orange County hotel, according to Irvine police. Days after these pictures were captured, Dorner allegedly began a revenge-motivated shooting spree, sparking a region-wide manhunt for the former LAPD officer.

Updated at 8:18 AM PDT on Tuesday, Feb 12, 2013

Former LAPD officer Christopher Dorner — the suspect in three killings that have targeted law enforcement and the subject of a continuing manhunt — was suspected last week of fleeing to Mexico, according to a federal court document.

The criminal complaint filed in federal court on Feb. 7 charges Dorner with fleeing to avoid prosecution. It states that there was reason to believe he had crossed the border into Mexico.

Numerous False Leads Followed in Dorner Manhunt

Police have followed numerous false leads across Southern California to try to find Christopher Dorner. Meanwhile, a federal affidavit suggests he could have crossed the border to Mexico. Robert Kovacik reports from downtown Los Angeles on Feb. 11, 2013. (Published Tuesday, Feb. 12, 2013)

McClusky recounted the Irvine Police Department's request for assistance from the U.S. Marshal Service in finding Dorner after he became a suspect in the Feb. 3 killing of Keith Lawrence and Monica Quan, who is the daughter of an LAPD official mentioned by Dorner in a manifesto that details his alleged revenge plot.

Federal Criminal Complaint Suggests Dorner Fled to Mexico

A federal complaint against murder suspect Christopher Dorner says he is on the move. Authorities suggest he is no longer in Big Bear, and has fled to Mexico. Investigators are still following all leads in California and in the States. Joel Grover reports for the NBC4 News at 5 p.m. on Feb. 11, 2013. (Published Tuesday, Feb. 12, 2013)

McClusky described "the recent observations of a suspect matching Dorner's description attempting to flee to Mexico," and stated "there is probable cause to believe that Dorner has moved and traveled in interstate and foreign commerce from California to Mexico" to avoid prosecution.

The document also states that U.S. Marshals were tracking a Dorner associate identified only as "J.Y.," who had been spotted in Costa Mesa.

The search for Dorner continued in Big Bear on Monday, even as police followed multiple sightings of the former officer that turned out to be false.

Also on Monday, the Riverside County District Attorney's office filed a charge of murder against Dorner in the shooting death of Officer Michael Crain, who was killed in what authorities have described as an ambush. Crain was shot Thursday while he and his 27-year-old trainee partner were sitting at a traffic light near the Riverside Freeway in a shooting that police described as an ambush.

"We felt the state of the evidence dictated there was no reason to withhold filing charges," Riverside County District Attorney Paul Zellerbach said. "He's a felon at large."